client: safari support: s/Number.isNaN/isNaN/

Number.isNaN is slated to be added in ES6, support in safari/chrome is
non standard, and we don't have to.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/client/view/graph_view.js b/src/client/view/graph_view.js
index 93e774aa..9ee59c03 100644
--- a/src/client/view/graph_view.js
+++ b/src/client/view/graph_view.js
@@ -964,11 +964,11 @@ function GraphView(spec) {
     }
 
     function check_for_nan(x) {
-        if (Number.isNaN(x)) {
+        if (isNaN(x)) {
             console.log('nan problem');
             layout.stop();
         }
-        return Number.isNaN(x);
+        return isNaN(x);
     }
 
     var newnodes=1;